I would prepare for treatment, but hold any treatment until you can positively identify the parasite if any.
As ick develops, your fish may display other signs, like, rapid breathing, glassy eyes, lethargic, stops eating.
Sometimes fish can get ick, but if strong, settled and well fed, can fight it off.
Ick is not a fast killer.
Always diagnose accurately before settting treatment.
See pic below of my Blue, see those spots, had them on and off for years and I have had no deaths at all In more than 3 years.